(Al)thoughand though is actually the same but though is informal. Though, although and even though are actually the same in terms of grammar usage because they are all conjunctions however the position may vary because (al)though common position is as follows: (al)though+ clause + clause, clause + although + clause. While even though is only this : even though + clause + clause. This is just my idea and my understanding about the usage of the conjunctions mentioned.